Potentilla supina L. ssp. paradoxa (Nutt.)

Bushy Cinquefoil

Potentilla supina plant

Family - Rosaceae

Stem - Spreading to ascending, branched, pubescent with long, spreading hairs.

Potentilla supina stemStem.

Leaf - 3-15 cm long, petiolate, stipulate, hairy, compound with 5-7 leaflets. Leaflets 1-3 cm long, +/- elliptic, coarsely toothed.

Potentilla supina leafLeaf.

Potentilla supina stipulesStipules.

Inflorescence - Terminal panicles or racemes.

Potentilla supina inflorescenceInflorescence.

Potentilla supina calyxCalyx and bractlets.

Flower - Bractlets 5, 2-5 mm long, sparsely hairy, spreading. Sepals 5, 3-6 mm long, alternating with bractlets, appressed in fruit. Petals 5, 2.5-4.0 mm long, bright yellow, alternating with sepals. Stamens 20.

Potentilla supina flowerFlower.

Fruit - 0.7-1.3 mm long, smooth or somewhat wrinkled, brown, with a corky, winglike appendage along the inner margin.

Potentilla supina fruitFruiting head.

Flowering - May - September.

Habitat - Streambanks, lake margins.

Origin - Native to North America.

Other info. - This is one of the less common Missouri cinquefoils. It has been found exclusively in counties bordering the Missouri and Mississippi Rivers, and is probably waiflike, springing up sporadically from seed deposited by flooding events. This species is easily differentiated from the other Missouri species of Potentilla by its pinnately compound leaves bearing five or more leaflets.
The number of Potentilla species is greatly expanded in western regions of the U.S., and these can be taxonomically challenging.

Photographs taken at Klondike County Park boat ramp, St. Charles, MO, 5-15-2014 (SRTurner).